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Full Discussion: Doubt in structure -- c++
Top Forums Programming Doubt in structure -- c++ Post 59555 by DreamWarrior on Wednesday 22nd of December 2004 02:04:41 PM
Old 12-22-2004
I think before we answer properlly we need to know what you are trying to accomplish by the if(v) statement.

I assume that you want to know if a and b members have been assigned values? If this is the case then you'll need to initialize the members to a value that the user won't enter (if possible, otherwise you'll need other members to denote that the member has been entered) and test those members against the unassigned value in the if statement as follows:

Code:
static const int UNASSIGNED_VALUE = -1;

void main()
{
   ...

   v.a = v.b = UNASSIGNED_VALUE;

   if (v.a != UNASSIGNED_VALUE && v.b != UNASSIGNED_VALUE))
   {
      cout << "Entered" << endl;
   }

   ...
}

 

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LEARN ABOUT DEBIAN

gshadow

GSHADOW(5)						   File Formats and Conversions 						GSHADOW(5)

NAME

       gshadow - shadowed group file

DESCRIPTION

       /etc/gshadow contains the shadowed information for group accounts.

       This file must not be readable by regular users if password security is to be maintained.

       Each line of this file contains the following colon-separated fields:

       group name
	   It must be a valid group name, which exist on the system.

       encrypted password
	   Refer to crypt(3) for details on how this string is interpreted.

	   If the password field contains some string that is not a valid result of crypt(3), for instance ! or *, users will not be able to use a
	   unix password to access the group (but group members do not need the password).

	   The password is used when an user who is not a member of the group wants to gain the permissions of this group (see newgrp(1)).

	   This field may be empty, in which case only the group members can gain the group permissions.

	   A password field which starts with a exclamation mark means that the password is locked. The remaining characters on the line represent
	   the password field before the password was locked.

	   This password supersedes any password specified in /etc/group.

       administrators
	   It must be a comma-separated list of user names.

	   Administrators can change the password or the members of the group.

	   Administrators also have the same permissions as the members (see below).

       members
	   It must be a comma-separated list of user names.

	   Members can access the group without being prompted for a password.

	   You should use the same list of users as in /etc/group.

FILES

       /etc/group
	   Group account information.

       /etc/gshadow
	   Secure group account information.

SEE ALSO

       gpasswd(5), group(5), grpck(8), grpconv(8), newgrp(1).

shadow-utils 4.1.5.1						    05/25/2012								GSHADOW(5)
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